Among the best uses of a census anywhere in the world was perhaps what happened in the United States when, in 1850 and 1860, anti-slavery campaigners used numbers from two consecutive national censuses to build support for the abolition of slavery. They showed the number of enslaved people in the U.S. to be rising — contrary to arguments made by pro-slavery politicians. There have been numerous instances of such revelations using the census.
In option 1, additional information like international organisations, is used. In option 2, the claim is wrong. Politicians claimed that slavery was decreasing. Option 3 is correct. In option 4, ‘a census’ is mentioned, where the campaigners used two censuses to bring out the difficulties faced by slaves.
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